#include<bits/stdc++.h>
using namespace std;

long long  a[100010];

long long f(int a) {
	int a0 = a, s = 0;
	while (a0 != 0) {
		s = s + a0 % 10;
		a0 = a0 / 10;
	}
	return s;
}

int main() {
	int n;
	cin >> n;

	for (int i = 1; i <= n; i++) cin >> a[i];

	int max1 = 0;
	for (int o = 1; o <= n; o++) {
		if (f(a[o]) > max1) max1 = f(a[o]);
	}
	cout << max1;
}

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